Ok. If these fit to your scale and model cut them out from the print.Use scissors and cut them precisely. The eye you need to cut out as well.
Then stick the cut out pieces to a cardboard.But use not too thick one.
OK. Cut them out again. But try to make the edges of the jaws much shaped. A tip when cutting with scissors. if the line of cutting is circled, cut it with very short cutting steps.Or rotate slightly the element left cutting with longer step.